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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2021 Western Digital Corporation or its affiliates.
4 * Copyright (C) 2022 Ventana Micro Systems Inc.
5 */
6#ifndef __LINUX_IRQCHIP_RISCV_IMSIC_H
7#define __LINUX_IRQCHIP_RISCV_IMSIC_H
8
9#include <linux/types.h>
10#include <linux/bitops.h>
11#include <linux/device.h>
12#include <linux/fwnode.h>
13#include <asm/csr.h>
14
15#define IMSIC_MMIO_PAGE_SHIFT 12
16#define IMSIC_MMIO_PAGE_SZ BIT(IMSIC_MMIO_PAGE_SHIFT)
17#define IMSIC_MMIO_PAGE_LE 0x00
18#define IMSIC_MMIO_PAGE_BE 0x04
19
20#define IMSIC_MIN_ID 63
21#define IMSIC_MAX_ID 2048
22
23#define IMSIC_EIDELIVERY 0x70
24
25#define IMSIC_EITHRESHOLD 0x72
26
27#define IMSIC_EIP0 0x80
28#define IMSIC_EIP63 0xbf
29#define IMSIC_EIPx_BITS 32
30
31#define IMSIC_EIE0 0xc0
32#define IMSIC_EIE63 0xff
33#define IMSIC_EIEx_BITS 32
34
35#define IMSIC_FIRST IMSIC_EIDELIVERY
36#define IMSIC_LAST IMSIC_EIE63
37
38#define IMSIC_MMIO_SETIPNUM_LE 0x00
39#define IMSIC_MMIO_SETIPNUM_BE 0x04
40
41struct imsic_local_config {
42 phys_addr_t msi_pa;
43 void __iomem *msi_va;
44};
45
46struct imsic_global_config {
47 /*
48 * MSI Target Address Scheme
49 *
50 * XLEN-1 12 0
51 * | | |
52 * -------------------------------------------------------------
53 * |xxxxxx|Group Index|xxxxxxxxxxx|HART Index|Guest Index| 0 |
54 * -------------------------------------------------------------
55 */
56
57 /* Bits representing Guest index, HART index, and Group index */
58 u32 guest_index_bits;
59 u32 hart_index_bits;
60 u32 group_index_bits;
61 u32 group_index_shift;
62
63 /* Global base address matching all target MSI addresses */
64 phys_addr_t base_addr;
65
66 /* Number of interrupt identities */
67 u32 nr_ids;
68
69 /* Number of guest interrupt identities */
70 u32 nr_guest_ids;
71
72 /* Per-CPU IMSIC addresses */
73 struct imsic_local_config __percpu *local;
74};
75
76#ifdef CONFIG_RISCV_IMSIC
77
78const struct imsic_global_config *imsic_get_global_config(void);
79
80#else
81
82static inline const struct imsic_global_config *imsic_get_global_config(void)
83{
84 return NULL;
85}
86
87#endif
88
89#ifdef CONFIG_ACPI
90int imsic_platform_acpi_probe(struct fwnode_handle *fwnode);
91struct fwnode_handle *imsic_acpi_get_fwnode(struct device *dev);
92#else
93static inline struct fwnode_handle *imsic_acpi_get_fwnode(struct device *dev) { return NULL; }
94#endif
95
96#endif